Fix return value of _vmap_internals._get_name (#49951)
Summary:
This appears to have been a copy-paste error.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49951
Reviewed By: mrshenli
Differential Revision: D25757099
Pulled By: zou3519
fbshipit-source-id: e47cc3b0694645bd0025326bfe45852ef0266adf
